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    Re: Latitude by Lunar Distance
    From: Fred Hebard
    Date: 2006 Oct 5, 23:15 -0400

    On Oct 5, 2006, at 11:01 PM, Frank Reed wrote:
    
    >
    > "Now it is hard for me to believe that one can
    > measure distances with 0.1 or even 0.2 accuracy
    > permanently and reliably"
    >
    > Sure you can! :-)
    > I have seen amateurs get 0.1 minute accuracy in lunars on the very
    > first try. It's about the sextant more than anything else. Myself, I
    > find a typical error of 0.2 minutes of arc, and if I shoot four and
    > average them, that yields 0.1 minutes of arc accuracy, again and
    > again.
    > Of course, every once in a while my eyes will water or my hands will
    > shake, and then it's as much as ten times worse.
    
    
    Frank,
    
    I'd like to believe you, but show us the data.  Alex has very fine
    data and a good sextant.  I've done OK, but not 0.1'.  Jan Kalivoda
    reported a few years ago on some data collected from a German steam
    ship around 1875.  The standard error was around 0.25', as I recall.
    
    Fred
    
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